Silicon-carbon composite material, preparation method thereof and lithium ion battery
A silicon carbon composite material, silicon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low structural stability of composite materials, uneven dispersion of nano-silicon, large internal pores, etc., to improve the structure. Stability and energy density, avoid excessive expansion and shrinkage, and the effect of small pore size
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[0057] Correspondingly, an embodiment of the present invention also provides a method for preparing a silicon-carbon composite material, including:
[0058] S101, adding the graphite material into the sodium carboxymethyl cellulose aqueous solution, stirring and dispersing evenly to obtain a dispersion A;
[0059] S102, wet the silicon material with C1-C4 alcohol, and uniformly disperse it in water together with the amorphous carbon precursor, to obtain a dispersion B;
[0060] S103, add dispersion A and dispersion B to water and mix, stir and disperse evenly to obtain a mixed dispersion;
[0061] S104, drying the mixed dispersion to obtain a primary precursor;
[0062] S105, subjecting the first-level precursor to first-level heat treatment, molding treatment, cold isostatic pressing treatment and second-level heat treatment in sequence, and crushing and grading to obtain the second-level precursor;
[0063] S106. Coating the secondary precursor with carbon and tertiary hea...
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